slide 50

XPath has Conditional (if) Expressions

(not in XSLT but in XPath)

• These work as you expect
  • Evaluate expression
  • If true, evaluate then branch
  • If false, evaluate else branch
  • Return result of evaluation
• Syntax

  if (test-expression)
      then expression 
      else expression
  

• Example

  if ($part/@discounted)
     then $part/wholesale 
     else $part/retail
  

(As expression languages go, XPath 2.0 is stretching to become a programming language)